Quick answers
- Where does William B. Falk see patients?
- Medicare's clinician data lists 2 practice locations, including San Rafael, CA and Daly City, CA. Call before your visit to confirm the address.
- What is William B. Falk's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does William B. Falk accept Medicare assignment?
- Yes. Medicare's clinician data says William B. Falk accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for William B. Falk?
- (415) 456-7170, as listed in official Medicare / NPI Registry data.
- What is William B. Falk's NPI number?
- 1609942861. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where William B. Falk is enrolled with Medicare (CMS data updated 2026-10-02).
- 1601 5th AveSan Rafael, CA 94901 (415) 456‑7170
- 86 Hillview CtDaly City, CA 94015 (415) 528‑0532
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in San Rafael
Clinicians with the same Medicare primary specialty in San Rafael, CA — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1609942861 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians